Connecting Scsi Ports To Host(S); Connecting A Sun Storedge 3310 Raid Array - Sun Microsystems StorEdge 3000 Series Installation, Operation And Service Manual

4.9

Connecting SCSI Ports to Host(s)

By default, channels 1 and 3 (the upper middle SCSI port and lower left SCSI port on
the I/O module) are host channels. The array can be connected to a host in one of
the two following ways:
By means of an Ultra160 LVD-compliant HBA installed in a host
I
By means of a qualified and supported onboard single-ended server-embedded
I
SCSI controller
Connect the array to one or two hosts with SCSI cables. Refer to the Sun StorEdge
3310 SCSI Array Release Notes for a list of the supported cables.
4.9.1

Connecting a Sun StorEdge 3310 RAID Array

The SCSI specification states that the maximum bus length for Ultra3 SCSI is 25
meters for point-to-point connections. The Sun StorEdge 3310 RAID array uses a
point-to-point implementation. Each channel connector is on a separate physical
SCSI bus.
Taking into account the internal bus length of .5 meters and the internal SCSI bus
length of the host, the maximum SCSI cable length to each channel connector could
conceivably be around 24 meters when connected to an Ultra3 host adapter.
However, the longest Ultra3 cable qualified by Sun is 10 meters in length.
When connected to single-ended host adapters, the longest support bus length per
connector is 1.5 meters.
Note – When connecting to Ultra3 host adapters, all SCSI cables must be Ultra3-
qualified.
Note – If you connect two hosts to the same channel on a RAID array, you do not
need to change the scsi-initiator-id of one host adapter.
Chapter 4 Connecting Ports 4-19